Question 199435
L=W+3
2L+2W=78
2(W+3)+2W=78
2W+6+2W=78
4W=78-6
4W=72
W=72/4
W=18 ANS. FOR THE WIDTH.
L=18+3=21 ANS. FOR THE LENGTH.
pROOF:
2*21+2*18=78
42+36=78
78=78